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#pragma once
#include <util/generic/vector.h>
#include <util/generic/strbuf.h>
#include <util/string/subst.h>
/// Заменяет в строке одни подстроки на другие.
template <class TBuf, class TPool>
size_t SubstGlobal(TBuf& s, const TBuf& from, const TBuf& to, TPool& pool) {
if (from.empty())
return 0;
TVector<size_t> offs;
for (size_t off = 0; (off = s.find(from, off)) != TBuf::npos; off += from.length())
offs.push_back(off);
if (offs.empty())
return 0;
size_t dstSize = s.size() + ssize_t(offs.size()) * ssize_t(to.size() - from.size());
const size_t charTypeSz = sizeof(typename TBuf::char_type);
typename TBuf::char_type* dst = (typename TBuf::char_type*)pool.Allocate((dstSize + 1) * charTypeSz);
dst[dstSize] = 0;
typename TBuf::char_type* p = dst;
size_t lastSrc = 0;
for (auto off : offs) {
memcpy(p, s.data() + lastSrc, (off - lastSrc) * charTypeSz);
p += off - lastSrc;
lastSrc = off + from.size();
memcpy(p, to.data(), to.size() * charTypeSz);
p += to.size();
}
memcpy(p, s.data() + lastSrc, (s.size() - lastSrc) * charTypeSz);
p += s.size() - lastSrc;
Y_ASSERT(p - dst == (ssize_t)dstSize);
s = TBuf(dst, dstSize);
return offs.size();
}
template <class TPool>
size_t SubstGlobal(TStringBuf& s, const TStringBuf& from, const TStringBuf& to, TPool& pool) {
return SubstGlobal<TStringBuf, TPool>(s, from, to, pool);
}
/// Заменяет в строке одни подстроки на другие.
template <class TBuf, class TPool>
inline size_t SubstGlobal(TBuf& s, typename TBuf::char_type from, typename TBuf::char_type to, TPool& pool) {
size_t result = 0;
size_t off = s.find(from);
if (off == TBuf::npos)
return 0;
s = TBuf(pool.Append(s), s.size());
for (typename TBuf::char_type* it = const_cast<typename TBuf::char_type*>(s.begin()) + off; it != s.end(); ++it) {
if (*it == from) {
*it = to;
++result;
}
}
return result;
}
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